Option 4 is correct: The negative charges are transferred from wool to rod.
When an object is rubbed with another object, a process called charging by friction occurs. In this case, when the rod is rubbed with wool, the wool loses some of its negative charges, and these charges are transferred to the rod. As a result, the rod becomes negatively charged.
Option 1 is incorrect: In this case, there is no transfer of positive charges. The charges that are transferred are negative charges, not positive charges.
Option 2 is incorrect: The positive charges are not transferred from wool to the rod. It is the negative charges that are transferred.
Option 3 is incorrect: The negative charges are not transferred from the rod to wool. The transfer occurs in the opposite direction, from the wool to the rod.
Therefore, option 4 is the correct statement as it accurately describes the transfer of negative charges from wool to the rod.